Rock-drill.



No. 864,838. A PATBNTED SEPT. 3, 1907.

r 1 R. A. PoWDBN.

ROGKDRILL.

APPLIOATIOI FILED SEPT. 14.1906.

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y Roux DRILL. APPLIUATION FILED HEFT. 14.1906

PATENTED SEPT. 3, 1907.

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" PATENTED SEPT. 3, 1907. R. A. FOWDEN.

ROCK DRILL. APPLIUATION FILED snrT.14.19os.

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Wlan 0 9 g2@ um INVENTUH BY W TTHNEY.

ROBERT A. FOWDEN,

PATENT oEEIoE.

OF GERMANTCWN, PENNSYLVANIA.

BooK-DRILL.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed September 14,1908. Serial No. 834,580.

To all whom it may concern.'

`lle it known that I, ROBERT A. FOWDEN, a citizen of the United States,residing at Germantown, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inRock-Drills, of which the following is a specification.

My invention has relation to rock-drills; and in such connection itrelates more particularly to the construe* tion and arrangement of sucha drill.

The principal objects of my invention are first, to pro vide a drillwith a driving cam for the" blow striking means thereof, which acts as afly-wheel in storing up and giving off energy and which can be driven byany suitable motive power, such as steam, compressed air, water,electricity or explosive mixtures; second, to provide the driving camwith lifting and releasing portions and a driving or hammer portion topositively raise and lower an anvil and to release the same at theproper time so as to strike the blow free from the said portions of thecam third, toso arrange the lifting portion with respect to the drivingor hammer portion of the cam, as that the anvil will be slowly raised,hut quickly driven downwards to increase the force of the blow deliveredby the same and to a drill-bit connected therewith; fourth, to so shapethe back of the hammer or driving portion and a certain part of theliftingportion of thecam as to provide a gradually contracted path for aroller connecting the anvil with the cam so as to permit of a certainfree `movement of the roller and thus of the anvil at the beginning ofthe lifting movement and to prevent the pounding of the roller betweenthe said portions of the'cam at the lowering of the lifting speedimparted to the anvil by the cam; I fth, to provide the drill with achuck having formed integral therewith a head, projection and spiralwheel, respectively, adapted to removably connect the chuck with theanvil so as to limit the downward movement thereof, under certainconditions and also to turn the same; sixth, to provide the support forthe anvil with a buffer, which is adapted to limit the downward movementof the same, in case the anvil is actuated, without a drill bitcontacting with material to be pierced; seventh, to so connect the chuckwith the anvil and the support for the same as to permit of sidewiseintroduction and removal of the chuck and a turning device therefor.;eighth, to provide the chuck with a turning device to rotatethe same inone direction in the anvil and in the support for the same with a stepby step movement; ninth, to provide the drill in with a lockingmechanism., which automatically locks or releases the feed mechanism forthe drill so as to permit of the feeding to the same extent as materialis pierced by the drill and tenth, to so arrange the anvil that theforce of the blow of the drill-bit connected therewith may be increasedby the increasing of the speed of rotation of the actuating cani, or bythe ready removal of the anvil greater weight.

The nature and scope of my present invention will be more fullyunderstood from the following description taken in connection with theaccompanying drawings forming part hereof, in which Figure 1, is a viewillustrating partly in section and partly in side elevation a rockdrill, consisting of an an vil and chuck removably connected therewithand a drill-bit carried by the same, a cam for reciprocating the anvil,chuck and `drill-bit, a feed mechanism and an automatic controllingmechanism for the same, and means for rotating the chuck, all embodyingmain features of my said invention. Fig: 2, is a front elevational viewof the .rock drill. Fig: 3, is a detail view, enlarged, illustratingpartlyin side elevation and partly in section, the cam and rolleroccupying a certain position with respect to the driving or hammer andreleas ing portions of the same. Fig: 4, is an enlarged cross* sectionalview of the lower portion of the drill. Fig: 5, is a detail view,enlarged, illustrating in section a portion of the turning mechanism forthe chuck. Figs: 6 and 7, are respectively, enlarged cross-sectionalviews of the upper portion of thedrill. Fig: 8, is an enlarged verticalsectional view of the central portion of the drill; and Fig: 9, is asimilar view of the lower' portion of the drill. l

Referring to the drawings 10, isthe bed-plate of the rock drill providedwith a trunnion 11, adapted to be engaged by any suitable holder, notshown, by means of which the drill may be held in such aposition as towork in any direction desired. The bed-plate 10, is provided with athreaded spindle 12, operated by a handle 13, which by engaging a lug orprojection 15, of a support 14, imparts to the same a movement in aplane parallel tothe spindle 12, and also serves to hold the support on`the bed-plate 10, in any position given.

As shown in Figs: l., 6 and 7, the support 14, is pro' vided withgrooves 16, forming a guide rib 17 ,.which in conjunction `with a rib19, of a guide bar 18, forms the guides for an anvil, weight or block20, which by means oi ribs 21, respectively, engaging the grooves 16,and rib 17, of the support 14, and the rib 19, of the guide and thesubstituting for the same of an anvil having a bar 18, prevents sidemovements of the anvil or block 20, between the saine. In order torender the anvil 20, readily removable from `the support 14, theguide-bar 18, is connected with the same, by bolts 22, preferablypassing through distance pieces 23, interposed between the guide-bar 18,andthe support 14. The upper end of the support 14, is provided with twoextensions 24, supporting in conjljnction with bearing-plates 25, ashaft 26, which is driven from any suitable source of power, not shown.Within the extensions 24, and on the shaft 2G, are arranged two cams 28,between which terminate the upper end of the anvil 20, which by means oirollers 29, is connected with the cams, as

shown in Figs: 1 and 2. Each of the cams 28, is provided with a liftingportion 30, which by engaging the roller 29, slowly raises the anvil 20,during three fourths of a revolution of the cam 28, at which time theroller 29, having reached the releasing portion 31, at the end of thelifting portion 30, and by being engaged by the driving or hammerportion 32, thereof, is as well as the anvil 20, quickly forceddownwards during the last fourth of the revolution of the cam 28. Forthis purpose the driving or hammer portion 32, of the cam 28, extendsfrom the shaft 26, slightly in' advance of the releasing portion 31,thereof, and terminates substantially opposite the starting point 33, ofthe lifting portion 30, of the cam 28. I

As shown in Fig: 3, the driving or hammer portion 32, of the cam 28, isso arrcnged as to permit the anvil 20, to complete the downward movementthereof, free from this portion, at which time the roller 29, occupiesthe position shown in this figure. A chuck 40, secured to the anvil 20,and a drill-bit 41, secured to the chuck 40, will thus permit the anvil20, and its roller 29, to move upward independent of the driving orhammer portion 32, of the cam 28, in case the drill-bit 41, owing to thehardness of the material to be pierced by the same, rebounds therefrom.This free movement of the roller 29, is also permitted when the same inthe rotation of the cam 29, has passed beyond the starting point 33, ofthe lifting portion 30, and has reached the portion 35, of thepassageway 34, for the roller 29, formed by the driving or hammerportion 32, and lifting portion 30, of the cam. For this purpose theback 36, of the driving or hammer portion 32, of the cam 28, is soshaped as to enlarge the portion 35, of the passageway 34, up to thepoint 37, of the driving or hammer portion 32, of the cam 28, at whichpoint the passageway 35, merges into the passageway 34, slightly largerin width than the diametcr of the roller 29. The roller 29, owing to therebound of the anvil 20, contacts with the lifting portion 30, beyondthe point 33, thereof, and is now raised with a gradually increasingspeed by the same until the maximum speed is attained at which time theroller 29, has entered the passageway 34, about opposite the point 37,of the back 36, of the driving or hammer portion 32, of the cam 28. Bythe checking of the upward movement of the roller 29, and anvil 20, atthe point of greatest velocity by the lifting portion 30, of the cam 28,the roller 29, is forced against the driving or hammer portion 37, ofthe cam 28, from which the same rebounds. Owing to the contacting of thepassageway 34, at this point, however, such a forcing of the roller 29,against the driving or hammer portion and the same therefrom iseliminated.

By the above described arrangement of the passageways 34 and 35, for theroller 29, the anvil 20, is permitted to freely rebound from thematerial to be pierced by the drill-bit 41, and the anvil is then slowlyraised with a gradually increasing speed and is then quickly forceddownwards. The lifting portion 30, and driving or hammer portion 32, aswell as the releasing portion 31, of the cam 28, is preferablysurrounded by an annular flange 69, which prevents the disengagement ofthe roller 29, of the anvil 20, when the said roller 29, occupies theposition shown in Fig, 3. The cam 28, is provided with a counterweigh't39, arranged in the back portion thereof which in balancing the therebounding of ever, is prevented by the pawl 53, engaging the ratchetcam permits the same to act as a ffy-wheel in storing up energy duringthe time the roller 29, does not contact with the lifting portion 30,and driving or hammer portion 32, of the cam and giving off the storedenergy during the raising and forcing downwards of the anvil 20. By thisarrangement of the cam 28, the same is alsopermitted to absorb shock,due to the lifting and freeing of the anvil- 20, from the actingportions of the cam, which shock wouldotherwise be transmitted to allportions of the drill, as well as to the motor, not shown, employed toaetuate the camshaft 2G.

As shown in Fig'. 2, preferably two cams 28, are employed to evenly liftand force downwards the anvil 20, chuck 40, and drill-bit 41. In orderto resist all strain to which the chuck 40, may be subjected, this chuckas well as the head 42, at the upper end, a projection 43, and a spiralwheel 44, are formed integral therewith. The chuck is held in properposition with respect to the anvil 20, by projections 45 and 46, of thesupport 14, and is connected therewith by cap-plates 47. The head 42, ofthe chuck 40, by engaging a T-shaped groove 48, arrangedin the lower endof the anvil 20, is connected therewith and readily withdrawn sidewisefrom the same, as well as from the support 14, by the removal of thecap-plates 47, from the'projections 45 and 46. The upper projections 45,in conjunction with the cap 47, serves as a support for a buffer 49,preferably consisting of rubber, against which the projection 43, of thechuck 40, abuts, in case the same is operated without a bit or the bitis not contacting with the rock or other ymaterial to be pierced. Insuch manner the force of the shock imparted by the anvil 20, and chuck40, upon the projection 45, and by the same to the support 14, isreduced to a minimum. The projections 45 and 46, also serve to looselysupport a sleeve 50, surrounding thel chuck 40, which by the internalthreaded portion 51, engaging the teeth of the spiral-wheel 44, of thechuck, forms in conjunction with the wheel a rotating mechanism for thesame, as shown in Figs: 1 and 4. At the outer side the sleeve 50, isprovided with a toothed portion 52, forming a ratchet-wheel, which isengaged by a pawl 53, pivotally connected with the projection 45, of thesupport 14. As shown in Fig'. 5, the internal threaded portion 51, ofthe sleeve 50, is inclined in a direction opposite to that of the teethof the spiral wheel 44, so that when the chuck 40, is raised by theanvil 20, the spiral wheel 44, in conjunction with the threaded portion51, of the sleeve tends to rotate the same. This rotation, howteeth 52,of the sleeve 50, which is now permitted to rotate the chuck 40, anddrill-bit 41, for a defined distance. During the downward movement ofthe chuck 40, the sleeve 50, is again rotated by the spiral wheel 44. Inthis instance, however, in an opposite direction, which movement isfreely permitted by the pawl 53, held iii engagement with the ratchetteeth 52, by a spring 54. By this arrangement the drill-bit 41, isrotated with a step by step movement in one direction, during eachupward movement of the chuck and anvil.

In order to prevent breaking of the cams 28, by a too rapid feeding ofthe anvil 20, chuck 40, and bit 41, to-

wards the material to be pierced, the following automatic locking andreleasing mechanism for the feed mechanism oi the drill is employed. Asshown in Figs: l, 6 and 8, on the threaded spindle l2, is slidablyarranged a collar 55, provided with teeth 5G, and a key V57, engaging agroove 58, of the spindle 12. The collar 55, is normally supported by abracket 59, secured to the support 14, which is also provided with anopening 60, in which is arranged a lever 6l, pivotally secured in thepoint (i2, to the support 14. The lever at one end terminates above theteeth 56, ot the collar 55, and at the otherl end proj ectsinto a groove63, arranged in the anvil 20. The groove 63, is so arranged in respectto the lever 6l, that when the anvil 20, has descended and reached theend of its downward movement it will con tact with the lever 61, andbring the same out of engagement with the teeth 56, oi the collar 55,thereby releasing the same. The spindle 12, may now be freely turned inthe support 14, and by the same the anvil 20, chuck 40, and bit 4l, ieddownwardsin the bed-plate .10. As soon as the anvil 20, is liftedaspring 64:, will bring the lever 61, into rengagement with the teeth5G, of the collar 55, thereby automatically locking the saine and`preventing the turning oi the spindle and feeding oi the bit 4l., untilthe anvil 20, in its downward Inovement due to the progress made by thepenetration of the matter by the bit 41, is again brought -intoengagement with the lever 6l.. Thus the operator is only allowed to feedthe anvil 20, as fast as the bit Lil is penetrating the matter to bepierced and therefore the danger of breale ing the cams 28, rollers 29,or other parts of the drill, which otherwise would occur when the anvil20, is being driven downward by the cams 28, owing to the position olthe matter to be pierced with respect to the bit 4]., is therebyetfectually prevented. In order to reduce the force oi contact of theanvil 20, with the lever (i1, the same is provided with a bui'ier 65,consisting oi rubber or other suitable material. Instead oi moving theanvil 20, downwards when feeding the same for wards, the anvil may alsobe ied sidewise or in an upward direction depending upon the position ofthe hole to be drilled in the rock or other matter by the bit 4l. Inorder to permit the support 59, to also hold the collar 55, in positionthereon when the anvil 20, is moved in an upward direction to actuatethe bit 41, the saine is provided with an annular ektension 66,partially sur rounding `the collar 55. The extension 66, is providedwith bolts 67, engaging an annular groove arranged in the collar 55,thereby connecting the same with the support 59, and permitting oi afree rotation oi' the collar therein. The iorce oi the blow delivered bythe anvil 20, and the drill bit 41]., connected therewith, may beincreased by increasing the speed oi rotation oi the actuating cams 28,or by the substituting oi an. anvil 20, oi a greater weight, than thatemployed.

Having thus described the nature and objects of my invention, what Iclaim as new and desire to secure by Trotters Patent is i 1. In arock-drill, a cam having lifting, releasing' and drivingportions, thelatter forming` a hammer, and an anvil having` a tool connected withsaid cam, said cam and anvil arranged to form a cam driven drill.

2. In a rock drill, an anvil having; a tool, and a cam having lifting',releasing and driving portions, the latter forming a hammer and said camadapted to impart te said anvil a reciprocatory movement.

25;. In a roclcdrill, an anvil havinga tool, and a cam connected withsaid anvil and havin.;v lifting, 'releasing and driving portions. thelatter forming a hammer, the lifting and hammer portions oiz the camadapted to impart to the anvil n reciprocatory movement and thereleasing portion arranged to permitsaid anvil to ke a blowindependently ol. the lifting and hammer portions ot' said cani.

si. ln a rock-drill, an anvil having :1 tool, and a cam connected withthe anvil having lifting, releasing and hammer portions, the lifting andhammer portions of the cam arranged respectively to impart to the anvila slow upward movement and a quick downward movement, and the releasingportion ol the camy arranged to permit the anvil to strike a blowindependently o1 the lifting and ham iner portions and to permit ot acertain reciprocatorymovemeut ol' the anvil tree oi such portions.

ln a rock-drill, an anvil having a tool, and a cam connected with thcanvil having lifting, hammer and releasing p'u'tions, the lifting andhammer portions of the cam arranged to respectively impart to the anvila reciproca tory movement and the ri-:leasing and hammer portions ot'the cam arranged respectively to permit the anvil to strike a blow andto permit a certain tree movement up to the checking oi the upwardmovement imparted to the anvil hy the liftingl portion of the cam.

(i. ln a rock-drill, an anvil, a chuck carrying a tool connected withsaid anvil, a cam having, lifting, releasing and hammer portions adaptedto impart to the anvil a reciprocatory movement. and means engaging thechuck and adapted to rotate the same in one direction in said anvil.

T. In a ro .^kdrill, an anvil, a chuck carrying a tool connected withsaid anvil.` a cam having lifting, releasing and hammer portions`adapted to impart to said anvil a recip rocatory movement, nieanssurrounding the chuck and adapted to he rotated thereby in oppositedirections, and means engaging the rotating means and adapted to arrestthe movement or' the same in one direction to permit said rotating meansto actuate said chuck.

S. In a rock-drill, an anvil, a cam adapted to reciprocate said anvil, asupport carrying said anvil and cam, a hed plate carrying;l saidsupport, a :feeding mechanism for shift ing said support on said hedplate and means connected with said feeding mechanism and anvil andadapted to automatically prevent actuation of said feeding mechan ismuntil released by said anvil.

il. In a rock-drill, an anvil carrying a tool, a cam adapted toreciprocate said anvil and tool thereof, a support i carrying said anviland cam, a hed plate carrying said support, a threaded spindle arrangedin said hed plate and adapted when rotated to shift said support on thehed plate in a plane parallel to said spindle, means slidalily arrangedon said spindle, and means carried hy said support and adapted tonormally engage the sliding means of said spindle to prevent rotationthereof, and said anvil when moved into a certain position with respectto said support adapted to release the engaging means from said slidingmeans.

10. ln a rockalrill, a hed plate, a support carried by the same, feedingmeans carried by said plate and adapted to shift the support thereon, ananvil, a chuck carrying a tool connected with said anvil, a cam adaptedto reciprocate said anvil, chuck and the tool thereof on said support,means carried hy said support surrounding said chuck and adapted torotate the same in one direction with u step hy step movement, andlocking means for the feeding means, said lockirnf.;- means arranged toprevent feeding of said support and hy the same the feeding of saidanvil, chuck and the tool thereof until released hy said anvil.

l1. In a rock-drill, a support having` projections, an`

anvil carried by said support and having a groove, a chuck guided in theprojections oi= said support :ind having a head engaging the groove ofSaid anvil and means for locking said chuck to said projections andadapted when removed therefrom to permit of the sidewise removal ol thechuck from the projections of said support and groove of said anvil.

1L. In a roclodrill, a support having projections, an anvil carried bysaid support and having a groove, means .for reciprocating said anvil onsaid support, a huller carried by one of the projections of saidsupport, a chuck guided in the projections oi said support and having ahead engaging' the groove of said anvil and a projection, the projectionof said chuck adapted when contacting with the butter to limit by saidchuck the downward movement of said anvil, and means for locking thechuck to said projections and adapted when removed therefrom to perA mitot the sidewise removal of the chuck from the same and said support andthe head thereof from the groove ot' said anvil.

13. In a rock-drill, a plate, a threaded spindle rotatably arranged inthe plate, an anvil, a support connected with said spindle and adaptedwhen actuated by the same to shift said support and anvil on said plate,means for recipro fatina said anvil on said support, a collar havingteeth slidably arranged on said spindle, a lever carried by said supportand engaging said anvil and adapted when entrati,"in;r the teeth ot saidcollar to automatically prevent rotation ot' said spindle, and vsaidanvil adapted when moved into a certain position by said reciprocatingmeans to automatically disengage the lever froln the teeth of saidcollar so as to permit o1; the tree rotation of said spindle.

14. lu a rock-drill, a plate, a threaded spindle rotatably arranged inthe plate` an anvil, a support connected with said spindle, said spindleadapted when actuated to shift said support and anvil on said plate,means for recipro catingsr said anvil on said support, a toothed collarslidably arranged on said spindle, a lever` carried by said support andengaging' said anvil and adapted when engaging the teeth of said collarto automatically prevent rot tion of said spindle, said anvil adaptedwhen moved into a certain position by said reciprocating means toautomatically disengage the lever from the teeth oi said collar so as topermit of the free rotation of; said spindle, means connected with saidsupport and holding said collar in a ce1'- tain position with respect tosaid lever and means engag ingsaid lever and adapted to normally holdthe same in engagement with the teeth of said collar.

l` 1n a rock-drill, an anvil, a chuck carrying a tool connected withsaid anvil, a counterbalanced cam having lifting, releasing and hammerportions adapted to reciprocate said anvil; chuck and tool thereof andto permit said anvil to strike a blow free from said portions of thecam, means for rotating said cam, said counter-balanced cam, whenrotated adapted to store up energy, while the anvil is free from thehammer and lifting portions of said cam to absorb the shock caused bythe striking of said anvil and to transmit the stored up ene 'gy to saidanvil at the beginning,T of the downward movement thereof.

lo. 1n a rocledrill, an anvil, a chuck carrying` a tool connected withsaid anvil, a counterbalanced cam having liit1ng,'rcleasing and hammerportions adapted to recip recate said anvil, chuck and the tool thereof,at variable speeds, and permit said anvil to strike a blow free fromsaid portions of said cam, means for rotating' said cam, saidcounterbalanced cam, when rotated, adapted to store up energy while saidanvil is free from the hammer and lifting; portions of said cam toabsorb the shock caused by the strikingv ot said anvil and to transmitthe stored up energy to said anvil at the beginning; of the downwardmovement thereof.

In witness whereof, I have hereunto set my signature in the presence of;two subscribing witnesses.

ROBERT A. FOWDEN.

Witnesses 1li-1o. W. Rican, LHoaus M. SMITH.

